android学习：菜单（Menu）的使用

最新推荐文章于 2024-04-27 14:05:24 发布

原创最新推荐文章于 2024-04-27 14:05:24 发布 · 908 阅读

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#Android开发 #Menu #菜单

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本文介绍了Android应用中主活动（MainActivity）与子活动（Activity2）之间的交互方式，包括如何通过菜单实现跳转与退出操作。详细展示了通过创建菜单项、响应菜单事件以及启动不同活动的方法。

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MainActivity.java

package com.example.examples_04_13;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	/* 处理菜单事件 */
	public boolean onOptionsItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		int item_id = item.getItemId();
		switch (item_id) {
		case R.id.about:
			Intent intent = new Intent();
			intent.setClass(MainActivity.this, Activity2.class);
			startActivity(intent);
			MainActivity.this.finish();
			break;
		case R.id.exit:
			MainActivity.this.finish();
		default:
			break;
		}
		return super.onOptionsItemSelected(item);
	}

	
	
}

Activity2.java

package com.example.examples_04_13;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class Activity2 extends Activity{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.layout2);
	}

	/* 创建Menu */
	public boolean onCreateOptionsMenu(Menu menu) {
		// 为Menu添加内容
		menu.add(0, 0, 0, R.string.ok);
		menu.add(0, 1, 1, R.string.back);
		return super.onCreateOptionsMenu(menu);
	}

	/* 处理Menu的事件 */
	public boolean onOptionsItemSelected(MenuItem item) {
		int item_id = item.getItemId();
		
		switch (item_id) {
		case 0:
			Activity2.this.finish();
			break;
		case 1:
			Intent intent = new Intent();
			intent.setClass(Activity2.this, MainActivity.class);
			startActivity(intent);
			Activity2.this.finish();
			break;

		default:
			break;
		}
		return super.onOptionsItemSelected(item);
	}
	
	
	

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="MainActivity" />

</RelativeLayout>

layout2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
	<TextView 
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="Activity2"/>    

</LinearLayout>

res/menu/main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/about"
        android:title="关于"/>
    <item
        android:id="@+id/exit"
        android:title="退出"/>

</menu>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.examples_04_13"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.examples_04_13.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity 
            android:name="com.example.examples_04_13.Activity2">
            
        </activity>
    </application>

</manifest>